Galaxy–Galaxy Weak-lensing Measurements from SDSS. I. Image Processing and Lensing Signals

Luo, Wentao; Yang, Xiaohu; Zhang, Jun; Tweed, Dylan; Fu, Liping; Mo, H. J.; Bosch, Frank C. van den; Chen, Shu; Li, Ran; Li, Nan; Liu, Xiangkun; Pan, Chuzhong; Radovich, M.

doi:10.3847/1538-4357/836/1/38

Cited by 25 publications

(26 citation statements)

References 92 publications

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“…A number of factors may affect the estimates of the halo mass. As a test, we repeat our analysis using an independent weak-lensing shear catalog obtained by Luo et al (2017) from the Sloan Digital Sky Survey (SDSS) DR7 (Abazajian et al 2009) imaging data using a totally different method (see Appendix). As shown in Figure 5, the results obtained from the SDSS data agree well with those from the DE-CaLS data.…”

Section: Tests Of Uncertaintiesmentioning

confidence: 99%

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Massive Star-Forming Galaxies Have Converted Most of Their Halo Gas into Stars

Zhang,

Wang,

Luo

et al. 2021

Preprint

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In the local Universe, the efficiency for converting baryonic gas into stars is very low. In dark matter halos where galaxies form and evolve, the average efficiency varies with galaxy stellar mass and has a maximum of about twenty percent for Milky-Way-like galaxies. The low efficiency at higher mass is believed to be produced by some quenching processes, such as the feedback from active galactic nuclei. We perform an analysis of weak lensing and satellite kinematics for SDSS central galaxies. Our results reveal that the efficiency is much higher, more than sixty percent, for a large population of massive star-forming galaxies around 10 11 M . This suggests that these galaxies acquired most of the gas in their halos and converted it into stars without being affected significantly by quenching processes. This population of galaxies is not reproduced in current galaxy formation models, indicating that our understanding of galaxy formation is incomplete. The implications of our results on circumgalactic media, star formation quenching and disc galaxy rotation curves are discussed. We also examine systematic uncertainties in halo-mass and stellar-mass measurements that might influence our results.

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Section: Tests Of Uncertaintiesmentioning

confidence: 99%

“…As an independent test, we also use a different shear catalog (Luo et al 2017) based on SDSS DR7 (Abazajian et al 2009). The difference between the two samples is twofold.…”

Section: Appendix A: Measurements With Sdss Shear Catalogmentioning

confidence: 99%

Massive Star-Forming Galaxies Have Converted Most of Their Halo Gas into Stars

Zhang,

Wang,

Luo

et al. 2021

Preprint

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“…Finally, we also perform galaxy-galaxy lensing measurements for the galaxy samples. Following Luo et al (2017), from the galaxy shear measurements we obtain the excess surface density (ESD) profile for each galaxy sample,…”

Section: Galaxy Clustering Measurementsmentioning

confidence: 99%

On the Constraints of Galaxy Assembly Bias in Velocity Space

McCarthy,

Zheng,

Guo

et al. 2021

Preprint

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If the formation of central galaxies in dark matter haloes traces the assembly history of their host haloes, in haloes of fixed mass, central galaxy clustering may show dependence on properties indicating their formation history. Such a galaxy assembly bias effect has been investigated by Lin et al. (2016), with samples of central galaxies constructed in haloes of similar mass and with mean halo mass verified by galaxy lensing measurements, and no significant evidence of assembly bias is found from the analysis of the projected two-point correlation functions of early-and late-forming central galaxies. In this work, we extend the the investigation of assembly bias effect from real space to redshift (velocity) space, with an extended construction of early-and late-forming galaxies. We carry out halo occupation distribution modelling to constrain the galaxy-halo connection to see whether there is any sign of the effect of assembly bias. We find largely consistent host halo mass for early-and late-forming central galaxies, corroborated by lensing measurements. The central velocity bias parameters, which are supposed to characterise the mutual relaxation between central galaxies and their host haloes, are inferred to overlap between early-and lateforming central galaxies. However, we find a large amplitude of velocity bias for early-forming central galaxies (e.g. with central galaxies moving at more than 50% that of dark matter velocity dispersion inside host haloes), which may signal an assembly bias effect. A large sample with two-point correlation functions and other clustering measurements and improved modelling will help reach a conclusive result.

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“…In a recent study, Luo et al (2017) used the background galaxies in the SDSS DR7 to measure ESDs around lens galaxies that are separated into the same luminosity bins as adopted here. The circles with error bars shown in Fig.…”

Section: Constraints On F σ 8 and Bmentioning

confidence: 99%

Mapping the Real Space Distributions of Galaxies in SDSS DR7. II. Measuring the Growth Rate, Clustering Amplitude of Matter, and Biases of Galaxies at Redshift 0.1

Shi

Yang

Wang

et al. 2018

ApJ

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We extend the real-space mapping method developed in Shi et al. (2016) so that it can be applied to flux-limited galaxy samples. We use an ensemble of mock catalogs to demonstrate the reliability of this extension, showing that it allows for an accurate recovery of the real-space correlation functions and galaxy biases. We also demonstrate that, using an iterative method applied to intermediate-scale clustering data, we can obtain an unbiased estimate of the growth rate of structure f σ 8 , which is related to the clustering amplitude of matter, to an accuracy of ∼ 10%. Applying this method to the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7), we construct a real-space galaxy catalog spanning the redshift range 0.01 ≤ z ≤ 0.2, which contains 584,473 galaxies in the north Galactic cap (NGC). Using this data, we infer f σ 8 = 0.376 ± 0.038 at a median redshift z = 0.1, which is consistent with the WMAP9 cosmology at the 1σ level. By combining this measurement with the real-space clustering of galaxies and with galaxy-galaxy weak lensing measurements for the same sets of galaxies, we are able to break the degeneracy between f , σ 8 , and b. From the SDSS DR7 data alone, we obtain the following cosmological constraints at redshift z = 0.1: f =0.464 +0.040 −0.040 , σ 8 =0.769 +0.121 −0.089 , and b = 1.910 +0.234 −0.268 , 1.449 +0.194 −0.196 , 1.301 +0.170 −0.177 , and 1.196 +0.159 −0.161 for galaxies within different absolute magnitude bins 0.1 M r − 5 log h = [−23, 0, −22.0], [−22, 0, −21.0], [−21.0, −20.0] and [−20.0, −19.0], respectively.

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Galaxy–Galaxy Weak-lensing Measurements from SDSS. I. Image Processing and Lensing Signals

Cited by 25 publications

References 92 publications

Massive Star-Forming Galaxies Have Converted Most of Their Halo Gas into Stars

Massive Star-Forming Galaxies Have Converted Most of Their Halo Gas into Stars

On the Constraints of Galaxy Assembly Bias in Velocity Space

Mapping the Real Space Distributions of Galaxies in SDSS DR7. II. Measuring the Growth Rate, Clustering Amplitude of Matter, and Biases of Galaxies at Redshift 0.1

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